A132243 Twin primes congruent to {1, 29} mod 30.

29, 31, 59, 61, 149, 151, 179, 181, 239, 241, 269, 271, 419, 421, 569, 571, 599, 601, 659, 661, 809, 811, 1019, 1021, 1049, 1051, 1229, 1231, 1289, 1291, 1319, 1321, 1619, 1621, 1949, 1951, 2129, 2131, 2309, 2311, 2339, 2341, 2549, 2551, 2729, 2731, 2789

Offset: 1

Author

Omar E. Pol, Aug 15 2007

Keywords

• nonn
• easy

Comments

Twin primes of the form 5*n +- 1. - Bruno Berselli, Aug 26 2014

Links

• Roger L. Bagula, Table of n, a(n) for n = 1..144
• C. K. Caldwell, The Prime Pages.
• C. K. Caldwell, Twin Primes.
• Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

Crossrefs

Cf. A001097, A001359, A006512, A039949, A129805, A132240.

Programs

Mathematica

a[0] = 9; a[n_] := a[n] = a[n - 1] + 10; Flatten[Table[If[PrimeQ[a[n]] && PrimeQ[a[n] + 2], {a[n],a[n] + 2}, {}], {n, 0, 300}]] (* Roger L. Bagula, May 04 2008 *)
Flatten[Select[#+{-1,1}&/@(5*Range[0,600,2]),AllTrue[#,PrimeQ]&]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Feb 21 2020 *)

Extensions

More terms from Roger L. Bagula, May 04 2008